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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  

#include "PxTkStream.h"

using namespace PxToolkit;

///////////////////////////////////////////////////////////////////////////////

MemoryOutputStream::MemoryOutputStream() :
    mData        (NULL),
    mSize        (0),
    mCapacity    (0)
{
}

MemoryOutputStream::~MemoryOutputStream()
{
    if(mData)
        delete[] mData;
}

PxU32 MemoryOutputStream::write(const void* src, PxU32 size)
{
    PxU32 expectedSize = mSize + size;
    if(expectedSize > mCapacity)
    {
        mCapacity = expectedSize + 4096;

        PxU8* newData = new PxU8[mCapacity];
        PX_ASSERT(newData!=NULL);

        if(newData)
        {
            memcpy(newData, mData, mSize);
            delete[] mData;
        }
        mData = newData;
    }
    memcpy(mData+mSize, src, size);
    mSize += size;
    return size;
}

///////////////////////////////////////////////////////////////////////////////

MemoryInputData::MemoryInputData(PxU8* data, PxU32 length) :
    mSize    (length),
    mData    (data),
    mPos     (0)
{
}

PxU32 MemoryInputData::read(void* dest, PxU32 count)
{
    PxU32 length = PxMin<PxU32>(count, mSize-mPos);
    memcpy(dest, mData+mPos, length);
    mPos += length;
    return length;
}

PxU32 MemoryInputData::getLength() const
{
    return mSize;
}

void MemoryInputData::seek(PxU32 offset)
{
    mPos = PxMin<PxU32>(mSize, offset);
}

PxU32 MemoryInputData::tell() const
{
    return mPos;
}
